package com.binance.basedao.anotation;


import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface Column {

    String name() default "";

    /**
     * (Optional) Whether the property is a unique key.  This is a
     * shortcut for the UniqueConstraint annotation at the table
     * level and is useful for when the unique key constraint is
     * only a single field. This constraint applies in addition
     * to any constraint entailed by primary key mapping and
     * to constraints specified at the table level.
     */
    boolean unique() default false;

    /**
     * (Optional) Whether the database column is nullable.
     */
    boolean nullable() default true;

    /**
     * (Optional) Whether the column is included in SQL INSERT
     * statements generated by the persistence provider.
     */
    boolean insertable() default true;

    /**
     * (Optional) Whether the column is included in SQL UPDATE
     * statements generated by the persistence provider.
     */
    boolean updatable() default true;

    /**
     * (Optional) The SQL fragment that is used when
     * generating the DDL for the column.
     * <p> Defaults to the generated SQL to create a
     * column of the inferred type.
     */
    String columnDefinition() default "";

    /**
     * (Optional) The name of the table that contains the column.
     * If absent the column is assumed to be in the primary table.
     */
    String table() default "";

    /**
     * (Optional) The column length. (Applies only if a
     * string-valued column is used.)
     */
    int length() default 255;

    /**
     * (Optional) The precision for a decimal (exact numeric)
     * column. (Applies only if a decimal column is used.)
     * Value must be set by developer if used when generating
     * the DDL for the column.
     */
    int precision() default 0;

    /**
     * (Optional) The scale for a decimal (exact numeric) column.
     * (Applies only if a decimal column is used.)
     */
    int scale() default 0;
}
